Who is Berenice Sweet from A Feast of Snakes and what is their importance?

Berenice Sweet is the older daughter of a doctor, and a rather spoiled young woman. Having been head majorette in high school and having dated the captain of the team, Berenice went off to college. She met a man, Shep, who is captain of the debate team. She falls in love with him, but still has lingering feelings for her ex boyfriend, Joe Lon. Berenice likes living on the edge, and enjoys pushing others to the same edge. She is a selfish character who cares little for others.